Question Buzzing

[Airdog]

New owner 2021 Galleria 24Q - makes a buzz noise for about 2 seconds every 1-1.5 minutes. Powered coach or batteries in STORE position. Seems to be coming from the right rear area but I can't narrow down as to upper or lower area. Any ideas?
Thanks in advance.

 

[Kevin D Pem]

Buzz as in buzzer,or hum? All the time or when you activate something?

Always give the most available information.

 

[Airdog]

It typically will cycle every 2 minutes or so - the buzz last about 2 seconds. I've been able to make it stop by starting the engine - idle for a few minutes with batteries in Store and Solar Off. Today I noticed an error code on the solar charging unit that says the controller doesn't recognize the batteries. The coach shows more than 13v however. I assume from charging from the house (shore power 30a) or with the engine running.
I traded a 2014 RoadTrek that had much better documentation than the Galleria so I'm a bit disappointed even though the Coachman is a bit more comfortable .
I can't find what this selector is for in the documentation. My guess is for hot water but I don't see a reference.